ilona.....I own pretty much every Instant Hair pack you sell and I love them exactly the way they are. If I would change anything about them, it would be only changes to the posing (not so many straight on and more with the head tilted or bent slightly). I would also love to see more for the males (M4 especially) and more styles to fit the fantasy genre (such as elven, longer warrior type, etc). But I do love them and very often mix the various styles to achieve the look I want. Your hairs are very versatile in that aspect.

I'm not sure I would want the price changed since, as much as I love your hairs, I find it difficult now days to work the price in my budget. So perhaps a compromise? Make some the same way you have always done for those of us on a budget and perhaps the higher resolutions ones could be priced higher. If I had the money, I'd buy those as well. Not much help, I'm sure, but at least it gave me the chance to let you know how much I love your packs.
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If this helps any, I usually render at 1440 X 900 and have yet to find a hair that does not fit my characters.** Even if I do a close up and have to re-size the hair upwards, I lose no quality in doing so. Hope this helps you.