Allright, I'll bite:
Being able to use my photography hobby for something useful, rather than just images that sit forever on a thumb drive.
Engaging with others and helping drive community interaction and hopefully growth.
Gradually building a small "savings account."
3 brilliant things, I have loads and loads of pictures on memory cards, that I keep going through and have many drafts on my main account started, I just need to upload pictures.
Community interaction is great and first impressions count for new users as to whether they stay or go, not too mention space users having a look and not joining etc.. So yes interaction is vital for growth, so thank you for doing that!
Savings of any kind rocks!