Hi,
I totally agree that wild animals are totally unsuitable pets. It has taken thousands of years to domesticate the animals we live with. Even then you only have to look at the ever increasing number of "behaviour problems" seen in domestic animals to realise that we haven't really got the hang of it yet. Please think, it was only in the past few years that we discovered many apes and monkeys eat and hunt meat so what real hope has anyone of giving a monkey a suitable lifestyle? Once mature a pet monkey can become as dangerous as any wild animal. It is a lovely thought but the reality would certainly end in misery for the monkey and you.
In short, don't do it- give the money you save to an ape rescue charity instead and listen to some of the heart breaking stories that a little thought could of prevented. Please try looking up Monkey World in Dorset, England