To answer the OP, really any amount you feel comfortable with. Don't be a Scrooge, but don't feel pressured to give 50pp per port unless you have the means to do so.
As a poor Druid on red, I never set a strict amount, I just figure people will pay what they can.
If you can't tip, just let the porter know before hand, I bet most will be accommodating - especially if you're new.
The worst is when you give someone who clearly has gear a port and when you arrive they just say, "thanks!" and drop the group. I get that it's up to the porter to set a price before porting, but even some reasoning "no plat or gems on me, will get you back some other time" or "this is my main and I'm super poor, sorry" helps in reassuring the porter their time is appreciated.
I keep a list of people that don't donate without giving any reason, because it's a waste of my time to deal with them.
OTHER TIPS FOR POOR CHARS LOOKING FOR PORTS.
1. Don't be pushy, if the porter says they will get to you soon, give them at least 10 mins.
2. Be at or near the rings/spires you want to be ported from.
3. Be open about your lack of plat. Like I said, most are still going to be willing to help you and you won't be put on a shit list from not tipping.
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Dangus
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