In my opinion it shouldn't be ok to buy followers because if people like you than they'll follow you but if people don't than they wont follow you. By buying followers you can't see how many people like you or don't, you no longer have joy of seeing if people really like you. People can also consider this as cheating there are so many people out there who work hard for their followers and here you are buying followers that could be fake and you'll never know. Also buying followers is against the twitter rules.