Who was it posted all those links to team spending tables the other day? One of them was only a few mil more than us over a ten year period didn't they?
Not sure I understand how this is an anti-Moyes point. One team spent only slightly more than we did (aside from the others who spent a lot more) and they likely finished in a lower position over those ten years? Is it just that they didn't get relegated? For the record there aren't many teams with a few mil more than us on the 10 year (directly above us on the list is WBA who spent 15m more than we did ... and also got relegated). On the five year list however Swansea are 1.5m above us so that might be the team you're thinking about.
Looking at the five year table we are 18th overall (if you include teams which spent more but got relegated -- 15th in net spend for current Prem teams) out of 28 teams. (I looked at 5 year for this; we're 17th overall including relegated teams on the 10 year list so things aren't drastically different there.)
There are just three teams who have a lower net spend than us and have not been relegated in the last five years. However one of those three teams is Arsenal who spend a load of money on wages and would have spent more money in total so you could argue there are only two teams which have spent less money who have not been relegated.
Our per season net spend is the lowest of any team which has not been relegated aside from Blackburn (in serious trouble this year) Wigan (near the drop zone but will probably survive) and Arsenal (spend so much on wages their overall spend is far higher than ours). That's it.
Now, I will grant that wages are an important factor (I disregarded Arsenal because they have spent more than us in wages) so it's only fair to include wages for Everton too. However I don't have access to that right now. I'm sure it's out there and would welcome input. However QPR for instance, who are only three spots above us in net spend, have spent almost 30m net than we have. So the wages aren't going to be closing many gaps. We might catch Swansea and West Brom (1.5m and 8m more respectively) but the other teams are probably too far ahead for us to catch them in net spend + wages. It closes the gap a little maybe but I don't think it changes the results that meaningfully (although I may be wrong as I haven't done the maths).
Update: I found a wages table from 09/10. We're ninth. Villa were higher then as were Portsmouth (and the usual suspects). Sunderland and West Ham were the same as us. Fulham was 5m less, Blackburn 7m less, Stoke 9m less. The teams significantly lower in wages mostly got relegated that year or subsequently. Wages might push us to 10th-14th place (although it's not only us who would move up -- Arsenal would also move up significantly too of course).
I'm not picking on whomever mentioned Stoke earlier because a lot of people have said similar things to this: there is this idea that a team like Stoke doesn't spend much more than us when in fact they have spent 60m to our 4m in the past five years. Sunderland 70m. Villa 70m. Bolton 50m. Fulham 46m. Wolves and QPR 35m. Incidentally that is not a list of overwhelmingly successful football clubs in the last 5 years. Now you can of course still want Moyes replaced but it's really amazing how much some of these teams have spent (and wasted). Sunderland in particular have spent a massive amount (and remember they are not a team with lower wages -- at least not on the 09/10 list) to try to close the gap with us (and depending on how this year shakes out they aren't there yet).
I've probably just wasted my time as I doubt anyone will ever change their mind. Looking at Sunderland however IMO that's what a good manager buys you. They have to spend 70m to become slightly worse than we are from spending 4m.