Been 4 times, mostly for functions.
The last function I attended, we all left as they a) made everyone join at a cost - even the out of towners, b) were listed as a support vendor for our organisation, with accounts billable at no cost to us while we were attending (it was all supposed to be free for us as the government was paying) and they refused to accept the card on file, stating we all had to pay on our own cards then request refunds.
We all left and upper management cancelled their vender status... At a cost of over $200k a year... Over what would have amounted to a $500 in total.