I don't know if you're similar, but I'm happy to tip here and boost on fountain, because I also earn those sats there. For some reason, using the sats where I earned them feels a little different than sending sats somewhere else. 

I know it's completely irrational, but it's also worth noting how people's psychology plays into Bitcoin usage.

Undisciplined

bitcoin

Spending Bitcoin - A Weekend Discussion

I'm happy to take the tax hit on using my BTC to promote services like Fountain and Stacker. However I find it difficult to use it on large goods/more costly items because the hodl mentality kicks in and makes me think of my buying power in the future so I'm more inclined to use dirty fiat 🙂