If I'm inclined to port, 10pp is enough, provided there's nothing special going on. More is certainly nice but if I'm not inclined to port, I don't care how much you're offering and it becomes insulting when people push after I say I'm not available (this is thankfully rare).
I would say that rather than worry over whether the amount you intend to pay is enough, let the porter know ahead of time how much you're offering and let them decide if it's enough. If you're poor, learn to get around on your own (boats, running, firepot room). Teleporting is a luxury.
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