What kind of a developer can't afford a $50-60 tool? If its actually needed
In a company, you save more than that: the hassle of purchasing and managing licenses. You can also install more copies when needed, without asking permission from anyone.
VMWare is actually more that $50-$60. The version of VMWare Player licensed for commercial use is 117.39 € (excluding VAT), and if you want the full VMWare Desktop product (which would be a more accurate comparison to VirtualBox), it is 186.96 € (checked today at their web site).