Great plugin but costly to use pro features

It’s been a few weeks since my site went live and the plugin seem to be working well. The database data is also fairly clean (easy to extract data back if you have PHP My Admin). The plugin also allows you to easily customize the buttons and styles without changing the plugin itself – a great feature. The main downside to me is the cost of upgrading to PRO; I really wanted to support the product but there seem to be only 1 level of upgrade and it’s too expensive for the feature that I wanted (be able to have different icon for different locations). It would be great if the pro options were more a-la-cart rather than all-or-nothing.