Im not familiar with texter. Robo is fine to use. Its just a form filler. Back when the caffeine sweeps were one prize, per sweep, per day I won a lot of them. Robo doesnt work with flash forms and caffeine sweeps are flash. Thats one of the reasons I avoid them.

You can use Robo and are not in danger of getting DQ.
its hard to say why you arent winning. It can take months for the wins to show up. Do the instants and enter a lot of sweeps, every day.
good luck
as far as winning any sweep it depends on how many are entering and what the odds are if 350,000 people have enterd and it lasted for only 10 days and only 1/10th entered daily and the rest entered only 1 time then the basic odds would be 1 in 700,000 chance per each entry! I enter those sweeps daily and have never won but there is usually only 1 prize that is given away on some of them.