They could but I doubt they will. If it's only to get CC data $1 EA would do it.  I don't think Trump wants to discourage anyone who wants to attend his rallies,  1ffa   and if they want to donate to the election fund they will have opportunity to do that. Hillary used to charge at every opportunity, Trump doesn't. Parscale will fine tune his screening process as necessary, he has a mountain of data from this event.