Personally, I almost never buy from a website that doesn't publicly show it's prices or isn't transparent about the costs involved.
Show your pricing compared to your competitors and allow your visitors to draw comparisons between the features you offer as opposed to your competitors products. This works best if your product can alone replace multiple other products, saving your users time and money.
By offering an All-in-one price comparison, you make the decision making process easier for your users by doing the comparison for them.
You can also leverage this to your advantage by comparing your pricing with how much a user would have to spend to combine several alternative products.
Showing how expensive it would be to access the same features helps to highlight the affordability of your product, making it more desirable and useful in the user's eye.