I completely agree with the line, "Treat the stock options like a lottery ticket. You should work for your startup because you believe in the founder's vision, not because you think you will get rich". Bad behavior (hopping to startup to startup looking for the pot at the end of the rainbow) leads to poor loyalty and high hiring costs. If you are not passionate about the business itself, then don't take the offer.
What Sean has done with Spree reinforces how powerful the Ruby-on-rails open source community is in developing complex code. The challenge is to keep on top of the changing e-commerce landscape and demands of end users. Ultimately a e-commerce site/platform is only as good as its ability to close out a shopping cart transaction.