The prize is always 0.05
BTC, we just have to reach the number of participations

False, the prize is ONLY .05
BTC if you get 50 people to participate. Which will never happen in a million years
Bad marketing = bad marketing
True, only
BTC0.05 if they reach a maximum of 50, which I think possible if they'll improve their marketing, so since you notice that they have a bad marketing, maybe it would be nice if you'll share some suggestion to help them improve it, you see that they are willing to spend to gain attention from gamblers, so they deserve to succeed.
Me, I suggest they run a signature campaign, that would help.
If you can offer this same amount since we are missing another week due to nations league play then this would be welcoming for more to participate.
No participants would object this, I'm waiting what their respond about your suggestion.