I think you should pay yourself a small salary and buy a delegation with the extra money donated / earned from posts and curation rewards.
Delegation are cheaper than they cost because most people using them often try to abuse of it and get flagged.
I don't think anyone would ever flag your introduction posts, so it would be the best way to make use of extra reward generated.
Will put some thoughts into that, I will let you know when I have come up with an idea of how to or why not ;)
Would also be interesting what others think on this!
I could use half the STEEM made from the weekly updates to rent some more power for example :)
Absolutely allow yourself a salary by upvoting your introduction posts! I allow myself one full power self vote a day as my "payment" for trying to use my delegations wisely. We can aim to be altruistic while still reaping a little bit of benefit.
As for renting a delegation, that is entirely up to you and how you want to invest in the future of Welcoming. I have rented delegations a couple of times, and didn't really see that it had much impact on my success or failure as a curator. But that could just be me. Some people find great success with renting delegations. Honestly, I have not looked at it since the SBD run up, so it may be more profitable now than it was when I tried it... I don't think @transisto would steer you wrong. hahah