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If you are going to lease SP, you should have a minimum of 45 posts and comments per week to breakeven by self-voting. However, you have approximately 72 votes per week at 100% Voting Power. So, if you only self-voted, which I don't recommend you could get a 35 - 40% return if you had 72 posts and comments per week. I support a 60-40% split between self-votes and curation to others. This way, you grow your relationships quicker without losing money. In the end, you will profit more by having a large group of loyal followers. Great question.