IMO it is down to age, location, prices, services and most of all the presentation of your profile. You could live/work in an area with a high population of prossies of the same age etc and this will lower booking opportunities.
@ CC. Don't worry about having to turn anyone away, if they had gotten in quicker you would have seen them if you wanted. If they really want to see YOU and not a random person then they will call again.
Why is the hotel situation getting you down so soon? You are still in the honeymoon period of whoring, it seems rather quickly to become disillusioned. Are you thinking of giving up your FT job and whoring FT.
The reason I ask is, you are a newbie and will get the initial flurry and then through time it will wean off. You could find a great incall apartment in time and then find that work has depleted and it's hardly worth it, especially when you add on all the service charges and buy in the items you require for a second location.
Perhaps you would be happier using service apartments where your husband could be in the lounge while you are working.
Remember also, for an incall apartment, you still have to pay all the extra bills over the quiet periods ie holiday periods like Christmas and New Year, your personal holiday, public holidays and when it goes quieter.
I've given all these negatives just to remind others too. I always had an incall apartment when I was whoring but it was my full time occupation, I would never have dreamt of doing that had whoring just been PT for me.