that's pretty smart of you :)

economics of a fundraising, random numbers but you can scale them up or down easily.

assuming you usually have $10k daily profits, and today you got even only $15k that's still 5.000$ / 50$ (average profit for you on a $500 project or whatever is an average project) = 100 new people that'll try you out. So total cost = $10k with no other costs (a part from fixed ones: hosting & support)

If just half of these 100 people will do another project on average in their lifetime cycle you already have covered your costs and make some good profits (100 / 2 * 500$ = $25k)

Without even counting all the free press! let's say $10 CPM and 200k people reached, that's a nice $2k of bonus