I was at MACNA this year and I enjoyed the overall experience. When it came to the raffle, I don't have an issue with volunteers getting free tickets, but do feel it should be more transparent. Either Friday or Saturday, my buddy and I were doing our rounds to drop in tickets when one guy had at least an inch or thicker stack of tickets and told my buddy to avoid the APEX as he was adding the entire stack. We later realized he was a volunteer and someone near us during the drawing said he dropped over $700 in tickets on the APEX alone. While it may have felt "unfair" that volunteers were winning, we were happy to see Heather win the APEX as she seemed always to be working hard. It never felt rigged or that I was cheated.
As for suggestions for next time. The biggest thing is transparency. If tickets are given to volunteers, it should be posted that tickets are provided as compensation. It would be best to see the total number/value of tickets supplied in aggregate and what percentage it makes up of the overall ticket pool. If I had this information, would I have changed my purchases? Nope. But it at least gives transparency to the process. You could even cap the total number of tickets "given away" or ensure it doesn't exceed a certain percentage. That would give an incentive to volunteers to sell more tickets, as it would increase their pool.
In regards to the comments about being paid and buying tickets with that money vs given tickets as compensation as being the same thing. I don't see it that way. If you're given $500, is your choice singular in that you can only buy raffle tickets with that money? Absolutely not. Would some volunteers do that, maybe? With tickets, the value is just in the raffle itself. A dollar can be used anywhere and it would be up to the individual to make a choice on how to spend that money. That makes it very different. Would someone with $700, buy $700 in tickets to enter a drawing for an APEX or would they buy some tickets for the APEX and if they don't win, use the rest towards an APEX? Most likely, they buy some tickets and buy the APEX outright if they don't win. That skews the drawing and odds towards those who didn't actually "buy" $700 in tickets for one item. It's not actually $700 to that individual as it has no value outside the drawing.
Again, I don't have an issue with tickets being provided as compensation, but transparency would have helped ease some of the tension. I also think that some of the issues may be the crowd in Vegas. Personally, my buddy and I decided we were going the moment it was announced in Vegas. While there, we met a bunch of people who have gone for many years, but I also assume that it was at least slightly skewed towards gamblers who know and play the odds. Without the transparency, it probably added to the comments and concerns of the raffles.