I’m not sure gifting ads would be the best idea. Providing sticky without the starter knowing would cause additional web traffic in which the starter may not of been expecting which would mean customer dissatisfaction. Always the option to gift funds though.
Or you could have to make them accept it and if they don't accept it within 7 days it goes back to the gifter
Gifting ads is useless, if you don't have the funds to place an advertisement anywhere here then maybe your service isn't doing to well, meaning you should lower your prices and earn some money yourself.
As Jayson said it adds a lot of complications if we were to try and implement this, I like the concept but doesn't appear that it is something we can do. I would also advise to provide them with the funds. Thank you for your suggestion.