Thanks and yes its a great way to improve your income and not just rely on people seeing your posts. I've also seen plenty of users lose support and upvotes because they don't respond to their comments, they're just there for post rewards and not actually about building a following.

I never knew about c-squared, i've received upvotes from them in the past but i'll check it out now that you mention it, looks like another cool opportunity

As for Dust Sweeper the value you send to it is kept in a little account for you and the bot will upvote comments you have with dustvotes until the value you sent is used up. You can read more about it here