It depends! The question is whether your revenues from mining will be larger than hosting costs. If you have a strong initial investment and are looking for some steady(er) income, you definitely could start mining but keep in mind that you are entering in a bear market, which is somewhat saturated with miners already. People renting planes full of GPUs to reduce transportation costs for instance.

If you really want to, you'll have to decide which coin to mine and which would generally be the one you see growing in value in the future. Look at GPU prices, their hashing power, and electricity consumption / costs. There are many different ways to do mining nowadays - not only the traditional setting up a rig at home, but also cloud mining or paying a fee for a company to host ASIC miners and so on. Look into it!

Here is an article our company wrote a few weeks back if you are interested, looking at the actual numbers of doing mining in 2018: https://medium.com/@power_mining/how-advantageous-is-the-power-mining-hosting-service-compared-to-mining-at-home-94c7db4cae95