I tag open all the time, I don't need to be payed for it. I do it for my guild mates and others who support my tag. because without them I would probably just sit in a tower also.
It is expensive to lay down a lot of siege, which I do. I can go though 250 pcs of guild siege every couple of hours if we are moving fast.
I couldn't do it without the heros in my guild who make it day in and day out, so it is a guild effort. Donations I always appreciate, people are very generous sometimes and I pass it along to our guild leader or deposit in the guild bank for them.