Official rules does not say anything preventing users to send merits to anyone, except maybe in cases of merit abuse or merit trading (that can earn you a flag)
In fact, we have small fun topic in our local board for predicting correct price of Bitcoin on specific date.
I will reward extra merit if someone make correct prediction, and I hope I will not be burned like a witch(er) for this
I think our thread is safe when it comes to things like this, since it requires some knowledge research and skill. Some charting and looking at various indicators or data to try to predict the correct price of BTC on a specific date and time, plus the poster that writes a good analysis or valuable opinion is rewarded extra merit.
It is crypto related, requires dedication, activates the community and adds value to the forum itself. Based on this I think we are more then good when it come to our summer fun topic.