Easily abusable. You could go into skirmish withs group of 3 and have them let you get top on the team every time for 3 wins and then do the same for them. If I've already spotted this it would be found and abused easily.
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Thus why tix do not guarantee an exotic loot. The percentages could be down around 5% or something. But you are right with 3v3. You can separate tix for different modes to adjust 3v3. Make it so it requires more wins to obtain a ticket from 3v3 modes.