The entire concept of meeting IRL is just so wrong and risky for obvious reasons, but the other issue for me is the 'showy' nature of tipping for that particular meeting in the public show.
There would have to be agreement in advance between the user and the model to accept the tip for that purpose, so why not send it offline?
Only reason I could see to send it for all to see is to gain maximum awareness of the entire audience, not so much for the size of the tip (as with all the above examples) but more about what it was achieving for the tipper in terms of bragging rights.
ETA: I checked the SC terms and noted that behaviour is not allowed there:
To keep the site safe, we also prohibit:
- Making any arrangements for personal meetings or shows outside the site.