If you want to know what cocaine is like, chug 3 or 4 red bulls kinda quick. This may not be any healthier but it is legal and cheap.
The thing about methamphetamine is that from what I understand it is neurotoxic at normal doses, and you have a much safer drug that's not going to be much more expensive available to purchase.
Around here (Australia) there is a huge difference in price, cocaine is hugely expensive and meth can be cheaper than legal cigarettes. I've heard of cocaine being much cheaper in the US but maybe that's regional? I think there are also supply issues, something that can be produced in a home lab is going to be around much more consistently.
Uh, we give it to old people in dosages around 1/80 of a normal user's high. I forget exactly what for.