Totally agree that this is so wrong.
The problem with not buying tickets for women's events with transwomen competitors, is that it would be assumed that no one wants to watch women's sports - which is part of the reason why women had and still have trouble attracting funding, television audiences and sponsorship etc.
What would speak volumes is for women to buy tickets to the events, then not attend in protest. To stand outside if necessary. We need to show that there is a market for women's sport but not if it includes legitimised cheating.
And on the cheating vs transing "and then oh accidentally being amazingly better than all your female competitors"; Sports people are accepted as being driven, focussed, making sacrifices or choices that many people would not to pursue their success etc and what qualities do sports cheats often exhibit on top of these?
An extra high desire to win - at any/ all costs, a super-need to be validated, approved of, lauded, praised, to be seen as the best, to be rich, famous, to continue a career or identity that they cannot let go of for fear of having nothing else or being 'nobody'? (Sound similar to identity/ personality issues to anyone else?)
These sports cheats will have an internal justification for their behaviour, an excuse that allows them to cheat without (much) guilt, something that legitimises their actions in their own mind despite knowing they break the rules, and they will go to great lengths to keep that internal justification intact so they can keep on cheating and winning, even when they know in themselves that they have cheated and do not legitimately deserve the credit, they still pursue cheating. (Sound similar to transactivists emotional manipulations of fact?)
So with the overlapping traits, I think yes, if you give some people an opportunity to satisfy deeply desired (and poorly controlled) emotional needs and to do so legitimately, then yes, I can see a lot of people(men) transitioning simply to win.