If you're botting with that many accounts and you expect a profit (and a great rate at that), using cheap proxies is kind of risky. You wouldn't really want to waste these 1k slave accounts, and with mobile proxies, the leverage you get is that these accounts will seem just like any other account on social media (unless you take bulk actions in a very short time). As long as the social media sites think you're a real person and can't trace your accounts to one person, you're good. Mobile proxies will help you more in this regard. Whatever the price may be, you need to make sure these mobile proxies are truly mobile, dedicated, and connect to real mobile networks. That's how you get a real experience.