I've had to start using them because I got fed up leaving wet patches, both on clothes and furniture. And no, to the poster who said it must be sweat, it's not. You can see clearly when it's a sweat patch and when it is neatly vulva shaped (and in any case you're cold rather than sweating!).
To the landfill worriers, the constant overwashing of clothes some of us have to do would be part compensation, no? Not to mention that the waterfall of discharge does, over a short amount of time, both bleach the clothes and underwear and leave them kind of stiff and manky, meaning they need to be thrown out and replaced sooner than they otherwise would. Surely you'd also frown upon that kind of consumerism too?
There is nothing wrong with my vag. It's perfectly healthy, I have had it checked. This is just how my body works. I resisted liners for years, partly due to the fear of thrush - until I found the constant dampness actually gave me thrush and the liners helped to create a more healthy environment in my case.
I'm not pleased about my copious discharge - I hate liners and hate having to be conscious of the dampness, and I can do without extra shaming from the neat, dry, discharge-free, thanks. Furthermore my husband loves it - he thinks it means I'm constantly hot for him, that I only have to look at him and I get all wet. I haven't bothered to set him straight :D.