I have been building paper/cardstock models since I was 13. The reason why I (initially) started building paper/cardstock models is because my family was poor and could not afford the models and toys that I wanted. The first model that I (scratch) built was a Colonial Viper. I used cigarette cartons, PVA glue, a cheap X-acto knife, cheap measuring equipment and some paint. I used a picture of a Colonial Viper from a picture book that I received as a gift, as a guide for proportions. It was not until 2009 that I found out about this site and got into building templates.
Throughout my years of model building, I have found that (depending on the genre) there are as many (and in some cases more) models available in paper/cardstock as there is in other mediums. Not only that but many of the paper/cardstock model templates can be just as (and in some cases more) details as other mediums.
There are so many aspects to paper/cardstock model building that make is a much better hobby over all, compared to other mediums (i.e. cost, materials, availability of templates vs kits, health benefits, The ability in correcting mistakes, and the list goes on).
Now, with that being said, I am not saying that the other mediums are bad, they are not. However I am saying that there are far more greater benefits to paper/cardstock model building than all other mediums combined.
Once again, welcome to paper/cardstock model building and welcome to Zealot!