Is it about the gameplay? Silly games like TifaTanX and some of our other beloved RoR games have very few CGs and animations (if any animations at all), but we still love it and come back because the game (while dirty) is more about the fun of playing around with it, and the scenes are built into the whole feel of it. (The first time poor Tifa lost her top had me giggling wildly.)
A good one of these games should be compared to regular games, the $3 to $5 price tag would be a fair thing to stick on most of them. If it's a bigger game that's closer to an actual full game that just happens to have some dirty parts, the value should go up accordingly. (There ARE H-Games out there that surpass the quality of games you'd grab at the local gamestop...)
Value: $3-5 for a quick and short thing. More if it's better.
Is it about the CG? Sometimes game makers aren't as good at game making but feel as though they need a more stable platform to release their artwork. They actually want a story surrounding it, and to give you a feel for who their character is. These games are often simple choice games, usually barely more "game" than a visual novel. (Visual novels fall in this group if you actually count them as games... I don't.)
Being all about the CG, the only way to compare these 'games' is to go find a CG set on one of the official sales sites and decide if you'd be willing to pay for that. Better ones really change the entire feel and give you a lot of mood behind the pics, while cheaper ones make you wonder why it wasn't just a CG set.
Value: Whatever the CG set would go for... possibly a bit more since they put the effort into the game and story.
Is it just about the quick buck? A step worse than being about the CG, sometimes a good CG set will be thrown into a shitty, shitty game, because games sell for more money. Or even worse, the CG will be crap, and the game is crap too, making anyone who actually paid for it regret it.
These games are easy to identify by a very small amount of CG, or the CGs being rehashed and reused constantly throughout the game. They often brag about a high CG number, only to find that most of them are the same CG with a slightly different outfit, or the hair has changed so they can call it a different girl, even though everything else is identical. "Games" like this usually only have the game attached to pad the fact that it's not worth it, and the poor design of the game often shows it.
Value: None. The instant these games are revealed for their crappiness, they deserve to be fileshared to anyone who has interest, so everyone can see how crappy it is before blowing money on it.
Then there's the rare few games that have both good CGs and good gameplay.
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His most recent game is a perfect example of this mix. When the CGs are made, and the game is made, and either one is worth paying money for, we get what everyone hopes is going to be what all games are. A fun thing to play, that has good material. It's the rarest thing to find, and when we do find one, everyone goes wild for it, naturally, making it the big talk of all the forums.
Value: CG+Game = $10 to $15 easily, more if it's a larger game with more CGs.