You won't be making money on that at 10$ per user. If you have a 10 user cap and 10$x10= 100$ and you're spending 149$... Put two and two together. Furthermore you still haven't come close to beating some of the other competitors who offer 1gb ports and SSDs + 1gb dedicated ram and 2gb burst for like 7$ a month...
http://leeware.com/
Site looks like crap and the owner lets you know that it's a completely unmanaged provider. The only thing he'll do is turn them on and off and give you access., but it's probably one of the most legit company out there. Been around since 1998.
But 500$ for 20x 4GB dual core servers isn't a bad deal.
You can make 40 services with 2gb of ram and sell those for 15$ a month = 600$, if you sell them all.
They have other plans like 10x servers for 300$, but of course the deals are better with more servers.
Edit: Ehhhhhhh maybe not... They pride on having clean services... They might not like what you'd be doing with it. But the guy who owned
www.vpsbotting.com (
www.frozenonline.com) used their services.