A huge advantage that Tumblr holds, is the ability to get free hosting. If you stop and think about it, there is no point what so ever to pay for monthly hosting. Instead you can purchase a beautiful theme that fits you needs, and publish whatever you please. This kind of perk is very useful to designers that want to showcase their portfolio. There are many great resources like Cargo Collective that provide mutual benefits, and will host your personal portfolio. However the downside is that you are stuck with a monthly service fee. If you do not pay the fee, or miss a payment say bye bye to your portfolio.