Works fine here as well.

Also, BMP is horribly large. That image you linked:

• As a BMP: 616 KB
• As a GIF: 1.83 KB (No colors in this one, so it's nice and compressed)
• As a PNG: 3.39 KB
• As a JPG: 8.63 KB

So in this particular case, the BMP version is 33,661% larger than the GIF.

I'll just toss this link out there: http://www.r1ch.net/img-formats/

In conclusion, I'm going to guess Chruser would prefer to save a bit of bandwidth...