Today has not been the best day for me. The guy I was gonna trade half a dozen bitcoins with suddenly dropped off the face of the earth, so now I'm stuck with useless fiat instead of cheap coins. Can't get it back on kraken until sometime next week because banks break on weekends (they really need to fix that bug).
Sounds as if you do not have a large enough float.. whether that is BTC or cash.
I don't usually conduct the trade on the exchange until after I have already locked in the profitable trade on Local Bitcoins or directly... and that is that I have actually either received the bitcoins from the guy or I have received the fiat from the guy.
To do that, you have to have enough of a float that covers the full amount of bitcoins or fiat that you are trading and usually a bit more because of transfer times and other cushion issues that sometimes can get the money or the BTC in their proper locations and set up for the next trade.... that transferring money around can be a bit of a hassle and sometimes cause additional costs - that tend to be lessened, somewhat with having a decent float (and even then, it may be a bit cumbersome to manage with some unexpected costs, here and there)
