@Ruckusfan, gotta love the enthusiasm for objective data 
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In what country are you based? Guessing UK given location data (given UK 31%).
Most striking data in your analysis is US 12%.
For multiple years, the number of active US listings has been more than half of total active listings. Now 6,465 US listings vs ‘more than 10,000’ global listings.
If US listings exceed 50% but only 12% of housesitters are US then there may be a great many US pet parents with few, if any, applicants to their listings. This reflects trend over recent years for seemingly many international housesitters to expressly avoid US listings.
While a year stale, thread below provides geographic data on listings … and an encouraging nudge that THS focus its marketing spending on Schengen area pet parents. 