Your attempt to make Seper the focus fails to address the larger issue, which is the disposition of the funds contributed to the Minutemen. Sooner or later the truth will come out. My own guess, based purely on the behaviour of the participants, is that the money-spent-on-immigration to money-spent-on-processes-and-facilitators ratio will be difficult to see on a pie chart.
If you're a donor to MCDC, and you're not happy with their efforts to bring the border problem to the forefront of the public's consciouness and the political agenda, ask for a refund.
Otherwise, it's hard for me to understand how it's any of your business.