If you want to buy 1000 bitcoins then cross the spread, take out the best offer, and buy 1000 bitcoins. If, on the other hand, you want to stick a bid into the

If you want to buy 1000 bitcoins then cross the spread, take out the best offer, and buy 1000 bitcoins. If, on the other hand, you want to stick a bid into the market in the hope that someone else will cross and take your (lower) price instead... then yes, other participants will react to that.