The Picto vendors usually have a lot of spots to fill in the Fall and it can get pretty hectic on their part. You might want to make it easy for them by letting them know you're ready for all the time on the road and why you're so certain that you can handle it. I think a lot of people that apply have found their circumstances in life change or they never understood the requirements of the job. I think I lucked into an interview a few years back, because a lot of the initial applicants that were high on their list couldn't uproot themselves for the requirements of the job.
There are some other companies that do aerial survey looking for low time pilots. I remember an ad in Lawrence, KS for a survey company that wasn't a picto vendor looking for 172 pilots, but I have no idea where they were based out of. If you want to spend some time on google I don't think it would take more than a few hours to track many of the other survey companies out there.
There are still a lot of great time builders out there for low-time guys who don't mind relocating. There was an ad just a few days ago on Climbto350 looking for traffic watch pilots to fly 172s in Dallas and San Francisco. I'm not familiar with the company, but a few of the guys I've bull•ted with in FBOs that have good jobs now seemed to really enjoy doing it when they were younger.
Also openings do happen throughout the course of the season. My first season with one of the vendors we had two guys hired a month to two months into the season and then another two hired towards the end of it. Don't get discouraged. There are a ton of opportunities out there and it's easy to get down on yourself when you think of how you get that initial time. The hiring processes at these companies are hard to explain and I always scratched my head a bit about how I was able to secure a position with the best vendor out there. That said I'd have happily gone to any of the other vendors back then and it seems like the some of the other vendors have been upping their pay as they have found it more difficult to get pilots.