Just wanting to know what others thought about this. SHould I spend more on getting signatures from users with lots of posts, which is what I am currently doing or post more often and buy premium membership for a year?
You have to calculate this on your own You can simply compare the 2 options and opt for the best one with DP premium membership you can have upto 4 sites in your signature area (if i am not wrong) I don't even know how much is DP membership for 1 year, between i know its 25USD for 3 months On the other hand, if you are going to buy signature space from other forum members then you will have to pay different prices for different spots which mainly depends on the number of posts the user has
Well you get access to much more than just extra signature links, so like the person above said you have to calculate it yourself.
Exactly try trial and error works the best because what may work for one person on here may not work for you.