How much do i think he would go for ? I don't know. But Pienaar went for £3m and was 6 years older and wasn't a hot prospect who is playing in the Champions League.
In other words, i reckon he'd go for a fair bit more than the £3m you suggested.
I see why you'd think so but I don't think we're talking £10m+ here, I really don't. I know Sturridge is expected to cost a fair bit but he's English and an attacker; I don't think Holtby is hyped as much as him (and I don't think Schalke are financially the same as Chelsea either).
I really think £3-5m will be the going price if he does go but we'll see.