Have you considered that your goal is to make a pumpkin pie, but instead you're shopping for aubergines?
How often do you read 300 words and think it's remarkable? How about 500 words?
[People remember OMG the depth of content is amazing, regularly]
On average, how many words per page do most of the top 10 results have, across a wide selection of keywords?
[2000 to 2500]
If you want the page to convert better, should you use long form or short form (more or less content on the page)?
[Long form outperforms short form, generally]
If social media is going to be used to promote the content, then you'll be hoping for likes, shares, thumbs up...
[Yes, again, more in-depth, lengthy content gets social love as compared to their brief content brethren]
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Quicksprout and KissMetrics usually share goodies like the above*
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Keep in mind that 300 words of mediocre content isn't necessary perform better when it's fluffed up to 2000 words of barely mediocre content.
Everyone probably knows one or more people who have ecommerce online shopping carts where they're trying to make as much money as possible by listing as many items as possible, even if the product descriptions are one liners. In many cases, they don't rank anywhere that can be found by potential buyers, and sell an equally dismal '0' units of them each month.
Yet, there are millions being earned by owners of single-product online stores. Personally, I'd rather have one big seller than 10,000 products that stay on the store shelves forever.
So, rather than looking to buy as many wee pages of barely acceptable content as the budget will handle, why not spend the time and money to develop substantially less, significantly higher quality, pages that will impress? Your rankings, sales and public opinion will thank you.
Or, as the post began... Why buy a bushel of aubergine when you're needing just one pumpkin pie?