Everyone seems to look at the price of seeds all wrong. everyone seems to have this crazy notion that seeds are stupidly expensive.
So you get nirvana seeds, you can get these for around 40 bucks a pack, I've grown a number of different strains from nirvana mostly their white strains. They haven't put much work into their genetics and are the equivalent of a marijuana knocking shop pumping out 1000s of low price seeds, they are so cheap because they dont put as much money into breeding and devloping strains.
Price 40 bucks
Then you get your decent quality genetics, these come from seedbanks like mandala (from hearsay) flying dutchman and other such seed banks, they offer quality genetics at a slightly higher price than nirvana, they produce their own strains of reasonable quality.
Price 50 - 100 bucks
You then get the top end seedbanks, these put work into their genetics win cannabis cups and other awards with their genetics that they have spent time developing searching out pheonotypes and trying to make the strongest and most consistent strains. Breeders that fall into this category would be serious seeds, th seeds, sensi and others like them.
Price 80 - 200 bucks
Then theres the cool strains, these strains have been developed from a clone only strain, they may have been backcrossed and sometimes they are not entirely stable but they can have amazing qualities.
price 50 - 240 bucks.
That leaves one category left, the ones that have clearly tried to overprice their seeds in order to look like they are good, pukka seeds has this category to themselves, stay away at all costs, they have fancy descriptions and nice pictures but it doesnt do what it says on the tin.
Price 60 - 900 bucks
When buying from nirvana or someone like them, your just buying some seeds to grow a plant that may be nice.
When buying from a higher quality seedbank with more exotic strains that comes with a higher price tag, its more like a franchise, you are paying to own that high quality strain. So they cost 200 bucks, if you get 5 females thats 40 bucks a seed. So you grow your 5 females, you take 10 clones and flower the females, you've got the strain still and you can keep it for as long as you want to.
Think about it this way, would mcdonalds sell you the option to provide yourself with something from their menu permanently for 200 bucks.