sure, my experience constant streams of income are generated from:
- loyal followers vote (can change)
- minnowbooster delegations
- minnowbooster vote selling
That are (relatively) reliable income sources. The first one is highly dependend on your established network. The other two based on much Steem Power. Therefore i can understand why boosters are often used by especially new Steemians with low SP. But the latter can harm the further development at a certain reputation level i think.