Why are there so few "evaluation" modules w/in the DNN world?

I find that very different from regular asp.net/.net components... Is it very hard to add limits (expiration and/or reduced functionality, etc.) on DNN modules?

Am I missing something?

>> Why are there so few "evaluation" modules w/in the DNN world?

We do - http://www.inventua.com/dnn-downloadshome.content.  But in answer to your actual question, I think the reason DNN module developers don't release time-limited or functionally restricted modules for evaluation is because the work involved in setting this up is perceived to be greater than the benefit - We discussed creating evaluation versions with restrictions and decided to just release unrestricted "try before you buy" versions instead.  But it's quite feasable to use registration codes, etc to turn features on and off, just not cost-effective in our case.

Why don't other module developers do this?  Probably because it adversely affects sales.  Our download->sales conversion rate ratio is about 1:1200, which is pretty bad if you are trying to make a living from module sales alone.  In our case, the retail modules lead commercial DNN users to our site, and we get referrals for DNN-related project and services work, so the whole thing is worthwhile financially.  But that's not the case for everyone, so they have to try and maximise sales by not providing evaluation versions. 

I agree with Nina.  All of the modules I've bought have all had sites where I could try them out, play with them a little while until I was comfortable that I could use them to do what I needed and I seen all of the options for administration.  Weather I could use them or at least see a screen shot of the ones I couldn't.

An perfect example of what I'm talking about is the hrefexchanger on the inventua.com site.  I was able to quickly determined that it probably wouldn't be able to do what I needed and then I noticed they were using it on the site.  Way cool!.  I got to look at the configuration information and see how it worked all at the same time.  It was an added bonus that I could have downloaded and tried it on my own server. So even though that module won't work for me I'll be going back.  Good all the way around.  :)