i think the free exp is the tip. i'm content using my own cauldron and i don't use it that much. it's more of a hassle on my part to send things over to other people. i brew some bogsneak eggs here and there and it's not profitable if i have to tip every time.

i guess other people wanted free exp, but i guess not. but if people are expecting things i guess they should say that they want it instead of relying on unspoken tip guidelines. especially since many players come from a culture where tipping isn't expected.