I have like 6, I know it's a lot but they are all different cuts. I love American eagle jeans I don't know if it's the same for men but for women they are insanley comfortable. Almost like sweat pants. I have one from A&F too they're good quality but 35$ are you sure? I used to work there so I got a pretty decent discount and mine were still more expensive. From what I remember their male jeans ranged around 90$ - 130$
I would say you should have 5-7 each day of the week but pick different styles for different personalities so you can change it up. Picking 5-7 doesn't mean you wear only jeans it just gives you a variety (: but same with shorts you should have 5-7, and if you like skirts then same with skirts. Of you like legging same with legging.. So on so forth
I have two pairs of jeans and they are both naturally ragged, faded and threadbare. I admit to tearing the waist-band off one. They look gorgeous, hugging me tight and showing little bits of skin. I feel the fashion for ripped jeans came from travelling to countries where the poor wear old, torn clothes, around the house or at work. You cannot possibly reproduce the look by paying through the nose for designer ripping. Go to a jumble sale and save money.
I think 3 or 2 is good but if you're lazy with washing them then get 5 or 7 one for every day of the week or if you're into fashion I have maybe 10. Some capris dark and light and grey skinny jeans etc.
I think 5-7 pairs is a good number. 3 is fine as long as you wash them and keep them clean. I think it would be better to have another pair just to know you have more clean clothes just in case you don't have time to wash clothes all the time. I personally think that you shouldn't buy jeans online unless you know that they are going to fit because you've bought them before or something. It's always good to try them on before you buy.
I have a few pairs, but only one pair of main pants that are small enough to comfortably wear. As far as numbers of pants go I'd say the max I'd be willing to own at one point would be probably three. As far as ripped pants go: I have no comment...