Larisa, the XStreet Exchange charged a commission as well, just in a different way, but it always factored into the price people offered. Most people buying Lindens couldn't be bothered to learn how to do a "mass pay" to make deposits, so they were paying 2.2%. The XStreetSL exchange also had a "30 pip spread" which had the same effect as a 1.1% commission. That totals to an approximate 3.3% commission. Just because you were not paying this commission directly, the people who bought your L$ when yo cashed out were paying it, and for that reason, and this affected the prices you could get.
Here for example were your various options (effective prices) for cashing out up until the Xstreet xchange close a few hours ago;
Lindex:
Immediate sale, plus days to "process credit": 265 + 3.5% = 274.3 L$ / $
Sell in less than an hour, plus days to "process credit": 255 + 3.5% = 263.9 L$ / $
Sell in 1-2 days, plus days to "process credit": 254 + 3.5% = 263.4 L$ / $
XStreetSL: -- more volatile, but below are fairly typical recent prices:
Immediate (Market) sale, Immediate withdrawal: 275 L$ / $
Limit Sale*, variable delay, immediate withdrawal: 267 L$ / $
Of course on the limit sales, you could set your own price, L$/$, but too low and you might wait forever for the market to go that low. Except for occassion lucky, random dips on Xstreet, your best price was always to wait about 5 days (average total) to cashout on the Lindex at 263.4. If you absolutey had to have an immediate cashout, then Xstreet's "typical" price of around 275 was not much different from the Lindex's fastest option at 274.3. Quite often you could end up with a much worse price on Xstreet, maybe up to 280 or so, depending on market fluctuations at the moment and sometimes you might get lucky and the market price would go dow to 270 or so. Generally speaking you were getting significantly worse prices on xstreet than on the Lindex -- those prices reflected what you (and everyone else) were willing to pay for immediate access to your money as well as the commissions ("conversion fee") payed by buyers and the "spread".