The general rule which I've heard is you "don't tip the owner." If you are setting your own rates, it fits the same pattern. Not tipping is appropriate in this case, unless you feel like the rate was significantly under-priced for the quality of work performed. In cases like that, I've actually told someone, "for the work you're doing I'm paying you $50 not $35 per hour -- keep it up!" In other words, give them a raise, not a tip.

Do you receive tips for the work you voluntarily do on a daily basis?

Do you not like receiving extra appreciation in the form of compensation when doing an exceptional job at your work?

I'd feel weird if my boss or my consulting clients tipped me.

Many organizations have variable, basically unpredictable, often big year-end bonuses tied to your whole team's $$ performance.