My two cents: don't care about amateur in Eventing. Much more important and meaningful in H/J land.
Just to recap what makes you a pro:
1) accepting remuneration for training horses
2) accepting remuneration for training people
You can braid, ship, clean stalls, sell horses, run a barn and still be an amateur so long as you don't 1,2,3 above.
And "remuneration" isn't just money.