I don't trade Nasdaq so I can not comment on OTC, but here is my experience with listed.
I am near the point where I will say goodbye to natural shorting, in other word if I don't feel there is a need to put up a bullet, I probably won't take the short. Keep in mind I don't do much size either. For higher end traders at my firm who does anything more than 2000 shares, they almost never go natural, always bulleting.
As we all know one of the biggest asset in NYSE trading is the tape, and one of the most basic rule is go long / add to position when you see a BID. On the short side, when you see a nice ASK, you will never get your short filled. The only way in is a bullet.
I don't know if you guys pyramid into positions, but I find it incredibly profitable to buy more on the long side when I see a BID stepping up, without a bullet, you can't do that on the short side.
Then there is the "is it a squeeze or is it a reversal"? When you natural short someone has to buy it from you, when someone is buying it from you the stock is upticking, when the stock is upticking the trend is against you at least the very very short term. The optimum time to short into a squeeze is when the rally is fading away, getting in too early, you risk a stop out, wait until you see actual weakness is great but you won't get filled, so in order to get filled you anticipate a short term top, which is fine, but result in lower percentage shots versus someone with a bullet who is actually waiting to see weakness before selling.
Also, in thin stocks, a size bullet can be incredibly damaging to the BID's, as one or two well placed 100 share direct plus sell orders can paint the chart and forces subsequent sell-off's. I would say some traders even use their bullet to create an illusion of "ASK stepping down" to scare people into selling.
Last but not least, if you make most of your money off the open, you will appreciate the power of bullets. Many many sell-off day's (bad news), a stock opens near unchanged, a big ASK shows up, you put your natural short in and beg him for a fill, he is not going to fill you, you watch the stock tank a point without an uptick even though you knew for a fact that it was going down. Sounds familiar? Bullets off the open is a HUGE advantage. Be cause not everyone got bullets, I think I have got noticably better fills when I use a market order on something with 10 x 500 than 500 x 10. Less competition because unlike the 500 x 10 where everyone and their mother go market long, in the case of 10 x 500 I usually get a friendly fill.