I do a lot of Wordpress development for clients. I've spent more on themes (between $30 - $80 per theme, usually closer to $40) than I have on plugins, and the themes often include functionality I'm looking for that I might otherwise use free plugins to create in a theme I'd build myself.

So far the main plugin I've spent money on is Advanced Custom Fields, purchasing the repeater field and options page add-ons. Cost around $40 USD I believe. Gives me a license to use those add-ons on as many client sites as I want.

I've also had clients purchase WooCommerce extensions like the PayPal Pro gateway ($79) and Stripe extension ($79).

Also, as I continue to build out http://BostonStartupsGuide.com, I expect I'll purchase SearchWP ($25) and Events Calendar Pro ($65).

So far I haven't seen the need to spend anything on WordPress plugins.

Have a developer's license for Gravity Forms and BackupBuddy and install those on pretty much every site.

If it's some small bit of functionality I will try to write it myself or do some creative copy/pasting. Most plugins are bloated with a lot of extra unnecessary stuff.

None. If I don't find one I like that I can use for free I write my own.

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http://wordpress.org/plugins/kennethrapp

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Typically nothing, one client wanted Gravity Forms so I purchased that for his site recently. Maybe a few WooCommerce plugin extensions, but that's about it.

$0.00 so far. Haven't found a need to.

I haven't spend anything as well.