Just to be clear, I'm not suggesting in any way that this is how the Traveller's Trophy should be scored now (not least because I'm not active in the TT at present). But just for interest, here's how it used to be scored in the 1990's.
The TT used to be run by Graham Dickenson, owner of Bistro 2647 "Fubar", which he sailed with his son Owen. I'm pretty sure Graham still has his boat, but it hasn't been seen out and about for a few years. The scheme went like this:
Any event which had 5 or more Cherub entries counted as a TT event. A boat's best 5 event scores were added up for its end of season result.
1st place scored 15 points plus one point for each boat beaten
2nd place scored 14 points plus one point for each boat beaten
3rd place scored 13 points plus one point for each boat beaten
and so on..
This gave a decent haul of points for first place at any TT event, but with extra weighting for a top position at an event with lots of entries (e.g. the Nationals). It also allowed some points scoring even for a boat which came last in 2 events, and in fact that boat might be rewarded with a decent score if it made the effort to get to an event which was less popular, with fewer entries. e.g. 21st at a 22-boat Nationals would score you 1 point, but 5th at a 6-boat event would score you 12 points.
The only downside was that Graham was the only guy who could remember how to score it and add it all up!