Why are you looking to buy a VPN? Are you going to be running a farm or is it just for accounts that aren't linked to your mains ISP? If you're doing it primarily for a different machine with a different MAC address/IP/Hardware, it's pointless. If it's primarily for different IP's whilst botting on your home PC I would just use proxies. If you're doing it for irl money, don't. You'll most likely loose more than you'll make due to you being, by the sounds of it, a novice botter.