Sponsorship fees for WordCamp US and WordCamp Europe don't let small businesses or even mid-sized businesses who don't live exclusively in the WordPress space to participate proactively.

Unless I'm missing something, the smallest package this years for WCEU was the newly introduced "Small Business Sponsors" - https://2017.europe.wordcamp.org/2017/03/23/wordcamp-europe-2017-sponsorship-exclusively-for-small-business/ - selling for 2500 EUR (or $2,839 currently).

A slight comparison with three major WordCamps in the US and UK (again - expensive areas, high standard, large audience overall):

1. WordCamp Boston 2017 - https://2017.boston.wordcamp.org/sponsors/call-for-sponsors/ - smallest business package $500 for 500-650 expected attendees
2. WordCamp Miami 2017 - https://2017.miami.wordcamp.org/become-a-sponsor/ - starts at $325 for an Agency, over 850 people attended last year
3. WordCamp London 2017 - https://2017.london.wordcamp.org/sponsorship/ - starts at £550 ($711)

Granted, there are different perks included for each plan. The audience of WCEU is still larger than the other events. But the bottom line is that the entry fee for WordPress businesses is still hard to grasp for most businesses active in WordPress but still failing to generate mid-six, seven, let alone eight figures from WordPress services and products.

Talking about inclusivity and diversity for attendees and speakers, discussing sponsors is worth keeping into account as well. We've already had a detailed and honest review of sponsorship value by Tony Perez here on the Tavern - https://wptavern.com/the-value-of-sponsoring-a-wordcamp-from-a-business-perspective