A few seeds found from indoor grown weed are the result of a hermie. In lots of cases, a female will pop one or two pollen sacks and make a few seeds. But if there is several strains in a room, you don't know which one was the daddy. Some oldtimers swear by hermie pollen. But they used it to make seeds in other females, not the hermie herself. My The Finger X Bug Topped strain is a hermie X female strain.
Seeded pot is just as strong as non seeded pot. There just won't be as much bud on a plant when it's seeded. It puts all it's effert into making seeds.