Which cheap young players? Ramsey, who everyone knew about, Gervinho/Giroud, strikers who had a big season in france who were neither cheap, particularly young or unheard of. Santos, older, expensive, big wage, well known(to be crap... that one was just everyone but Wenger), Squillaci, Podolski, Arshavin, Santi, Arteta, Monreal, Mertesacker.
Sorry just, which cheap young players no one has heard of is he buying every year. Sanogo, not many people pay attention to the french second division, and he was cheap... but does that make him a typical signing?
For the past 4 years at least our typical signing is a more average player on the back of the best season of their career inflating their prices beyond what they are worth, giving them big wages, who are pretty well known and not very wanted by anyone else.
Gervinho at 12-14mil, Mert at 8mil or so, Santos, Giroud. Typical Wenger in his first 6 years at Arsenal would have bought the likes of Giroud at 18 for 1mil and sold him at 25 for 15-20mil, he's currently doing the exact reverse of what he used to do.