Question for web designers: Browser Compatibility: Where do YOU draw the line?

[MikeTimbers]

Sure, I can understand 10% of your consumers is enough to make it worthwhile. But what if the developer hours spent checking on Mac and Linux browsers, and tweaking pixel perfect layouts, means time is lost that could be devoted to developing new features. Features that could generate twice the turnover? - the law of diminishing returns.

It's off-topic but to address the question:

Website features have a diminishing effect on turnover. The crucial driver for business value is the business offering. Do customers want what you're offering? The greatest website in the world won't help you one iota if there aren't any customers. And if there are customers, what counts is ease-of-use. The site I'm talking about has no flash, no video, no games, no forums; it's a deliberately simple, fast-to-load, customer-friendly site in front of a sound business model. There's more business benefit in having a great search engine for the site (and I don't mean a Google appliance) than having some fancy screen rendering.