Bro, I will give a humble advise free-of-charge. You asked a wrong question and that is why everyone is finding it difficult giving you the right answer. Isn't your question same as "what is the best penis size that can satisfy a woman?" Your question should have read "what is the strategy of earning 200-300k per month?"
With this focused question, we can now help you.
1. The bottom line is that an account is to a writer what a penis is to a vagina. Forgive my vulgarity bro, but what I mean to imply is that what matters is how you use it your account and penis.
2. You can have a prolific account and earn less than than a person with a dejected account. Haven't you heard donkey once worn a horse race?
3. What matters is strategy.
A. Writer A buys Writerbay at ksh 300, 000 and decides to write every order by himself. He works himself to dead writing at least 10 pages a day at a cpp of 3.5$. He ends up earning just about 70, 000 per month. He has big balls.
B. Writer B buys the same writerbay, employs 7 writers whom he assigns at least 10 pages a day and pays them a cpp of ksh 300 a day. They make him just about 70, 000 per month. He has big balls, too
C. Writer C is an experienced writer but does not own account. He writes for a trusted employer and works himself to dead by crushing at least 10 pages a day at cpp ksh 300. He ends up earning just 70,000 per month. He has big balls too.
D. Writer D buys 3 Qualitywriters account each at 10k (30k in total). He employs 4 writers and takes orders of cpp of at least 5 $ and assigns every writer at least 10 pages at cpp 300ksh. He earns over 150k a month. Like anyone else, he has sizeable balls too.
So who wins?
Conclusion: numbers are not in value of accounts. Numbers are just out there with you! And they don't lie!