Following are some of the reasons. 

• First of all, when you decide to reglaze your tub/sink or tiles, you are actually doing yourself a favor. You are actually saving a lot of money by not replacing it. Just think about if you have to take out every tile one by one and then replace it. The finishing look might not be satisfactory or it can be worse. Then the whole look will be ruined and what you will see is the torn out piece here and there. Reglazing is much less exhaustive to repair the tiles rather than installing the tiles. 
• Time is another factor. Demolishing an old tub or sink can take a lot of time and the results can be upsetting. The debris gets everywhere, dusts is everywhere, and you have to live without the tub or sink for a longer period of time. Reglazing leaves the existing unit in place and demolition is minimal or non existent. You will have your tub or time ready to use in fewer days as well.  Reglazing means you are creating something new out of something old, repurposing instead of replacing. It’s better for the environment and ends up being less waste in our already full landfills.
• Furthermore, reglazing is a quick and fast way to repair. When you reglaze your old tub that annoying mark is gone and a new looking tub is there for you to enjoy.  That sink crack that’s been bugging you for years can easily be refinished and reglazed quick and easy.
• Reglazing the previous items can be a source of happiness for many people. When you employ a professional tub, tile, sink reglazing company you can rest assured you will be satisfied with the end result.