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It is. I've always thought of it as a way for couples to rub it into singles faces that they are that. Its just another way for companys to line theyre pockets.

I wonder what other crappy holiday they'll make

As true as some of the stuff everyone has said is, some people get married for all the wrong reasons. You know, for money, for power, for influence (Political), for (well I can't think of the word) but something like a publicity stunt kinda thing, and even because the you-know was good.
And now for alittle personal data before I continue, Rachel, my wife, I knew when we were growing up. So a fight between us is nothing. We've had time to compare what we have in common and even time to practice not talking about stuff that we shouldn't talk about. You know, like old relationships. See, before our senior year in High School, I avoided her. I don't know why, but I avoided her, dated other people and still ended up with her. I don't know about her, but she said not to bring it up or it'll just piss me off. So, we just know what not to do or say around each other.
Anyway, most relationships seem to start at places they shouldn't be. Whether it be work, or at a bar. They most often don't work out. Actually, I have a friend who, well he met his first wife at a church one Sunday morning. Weird, I know. But, it all comes down to getting to know the person you're 'in-love' with.
And Bio, Valentine's day is just like any other Holiday type thing. One day it meant something, than the next a huge corporation decided, "screw you guys, let's make even more money!" Then people go buy gifts, and they buy more expensive things, which makes it seem like they have alot of money. So it leads to an example I had from earlier, where they get married because the other is rich.

Yes, anything can happen, but normally couples who've known each other all their lives or a good deal of their life, have a higher chance of staying together than two people who met in Vegas one night, and got married the next.

It's not guaranteed, but well, nothing can be guaranteed nowadays.

Yes, but I should point out that you said that 'I love' that doesn't imply that they shared your feelings. Quite possibly, the guy married that person/you so they don't seem gay. Or it could be he married the person/you for money. As I also said, some people have a false love based on money. So, when the person/you are a child, they are your friend, they see you have a better life style than his own/ or seem richer, they decide to fake it for the sake of money. Some cases they want to be with a family member (including older brother) so they settle for the person to wait for the family member. It's not too common, but it's also a possibility.

But that's why some don't get married. They just stay together.

True.

It's the latter.