So I got asked an interesting question yesterday. How would I scale my current online business efforts if I had 100K? 250K? It kind of threw me because:
1 - I've never thought past having 5-10K money to reinvest in SEO, content creation, and PPC

2 - I have done it long enough now to know just because you do something at 100 or even 1K USD doesn't mean it will equivalently scale if you simply double the dollar amount. IE I have one PPC campaign that from 1-$50 a day I can predict the outcome. From $50 to $100 per day the ROI significantly decreases.

Any pointers out there or lessons learned from those of you that have been around for a while?