PDF file size increases several folds after OCR

Hello,
I've been using Acrobat Pro 9. Whenever I receive a scanned PDF from someone, I always try to OCR it. I thought this would reduce the file size because it's saved as text characters instead of images. However, the file size actually increases several folds. For example I just had a scanned PDF with original size of 3M, but after OCR (settings: searchable image, downsample to 300dpi), the file size is > 19M. This is a legal document with no pictures or diagrams. Even ClearScan gives a result of 15M file. Could you help explain why and how I can change this? Thank you.
Hung

I just did an OCR with Searchable Image (exact); and here are all results
Original: 3,046 KB
Searchable Image (300dpi): 19,408 KB
Searchable Image (Exact) (600dpi): 3,377 KB
ClearScan (300dpi): 14,813 KB
So in this example, Searchable Image (exact) only causes about 10% increase in size. I used Save As "PDF" (not "Reduced Size PDF" or "Optimized PDF"...). Does this make sense? Thank you.
Hung

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