Getting a bike (or any vehicle or any big purchase) has two sides. The benefits are easier mobility from point A to point B, saved time and money over a long period of time. The costs are its regular maintenance, fuel, insurance and tax.
For any big purchase, the benefits comes with the costs. An important thing to consider is the opportunity cost. What’s the opportunity cost to having or not having a bike? Are you investing in an asset? If the bike can save you lots of time, create other income generating opportunities from it and give you a better quality of life, why not get the bike?