You'll need to develop good marketing material. Things like demo videos, which you can find plenty examples on YouTube, screenshots, and keyword rich descriptive text help people find your spreadsheet and communicate the value that sets yours a level above the rest. Excelville.com actually allows you to upload your spreadsheet with all of this marketing material in an easily searchable and user friendly website.
On the other hand, to hire and permanently maintain a team in charge of creating the right spreadsheet solutions for your business would be very costly. Added with the costs of regular spreadsheet-generating program purchases, the costs involved by forming and keeping a well-trained team of spreadsheet designers in your company can generate considerable financial losses to the business you are running, especially when you are the owner of a struggling micro-business. To eliminate the problems behind spreadsheet designing, the best option is to purchase high-quality ready-made spreadsheet solutions from a specialized, reliable provider.
The spreadsheet templates used for business purpose are also complex and these templates are used in stores and other business related affiliates. Profit and loss are mostly dealt with these spreadsheets. Invoice and other deposit related calculations also can be dealt with these spreadsheets.
You'll need to include more than a basic level of development and calculation in your spreadsheet. There are lots of free spreadsheets on the web. Most of which are very simple and easy to build. People aren't going to buy a spreadsheet that they can get for free. Take yours to the next level by adding all the value you can imagine. Then research on how you can offer a little bit more on the development and functionality side.