Pregnancy tests - why do it?

I'm seeing more and more people opening their pregnancy tests to "get a better look" or "because  they saw something". 
No offence ladies, but the minute you open them, any line you have got immediately goes invalid anyway. And if you think you can see a line, you probably won't see it any better without the casing anyway, so you may as well leave it on! You're only driving yourself mad. Just wait a few days a test again... I know it's hard but you're just ruining your tests anyway, so what was the point in taking them??
Not saying this to sound rude, but you know the answer you're going to get... a lot of responses telling you what I'm saying anyway! 
Don't mean to be harsh or rude or bitchy but it's better for you in the long run!