I'm a face/companion modder and I do it for my own amusement. I have files that have 10K downloads and 100 endorsement which for a companion mod that is not standalone isn't really that bad but it shows a certain lake of effort from the Nexus community as far as I am concerned. Making an original looking, unique and fully functioning companion is a lot more time consuming than most people think, making an interesting mod page can take almost as much time as the mod itself but it gives the mod a professional feel. My point is this, have there been times that I have felt like throwing the towel in because I don't see much appreciation from the community, well yes. I have come to the realization that if I make my core users happy that is all that really matters. People nowadays aren't as appreciative as they used to be and that is a fact. I endorse most all of the mods I have downloaded even if they ultimately do not work for me. I do this to foster the creativity the mod author has shown in his or her mod. I also look at mods as an expression of that author. I might not always agree with their final work but I feel like an endorsement is the least I can do for them and who knows it may spur the author on to improve and make something that really adds to my game.
Please endorse your mods, it's not like it costs anything and being human it is amazing how such a little (and free) gesture can make someone's day.