I have a neutral grip as well and I do not hold it "with a death grip". I do play a lot and that causes me to go through a lot of gloves. During the summer, I sweat a lot during practice and that really takes its toll on gloves.
I would say on a range from 1 - 10, 10 being death grip and 1 being light enough to fall out my hands, I hold the club at about a 6 (opposed to a 4 when putting).
I use StaSof gloves. PTL is just too hard to find and I don't like waiting on ordering gloves lol.
I don't clean my grips after each round, I do after a long practice session but other than that, I just clean the heads.
In a given season (approximately April - November), I will through 2 gloves a month or so (it may be important to note, I do not use the same gloves for practice and I do a round). I rotate gloves for practice using old gloves that I used for playing rounds. A glove unwearable for the course is still in great shape for practice where I am not as picky.
The thing about me is that I practice everyday and usually play 4 times a week. That's a lot of swinging a golf club and a lot of contact on a golf glove.