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I can't see how this could be reason for skepticism; this is just data and proportions between different data. Also, in the treatise olive-oil soap is described as something "special", the best...

Ehi, my friend, synthetic in 1830? Celluloid started to circulate during 1870's.

EDIT: Also, I guess that at the beginning celluloid could have been more expensive than horn (just thoughts.. you...

From the catalogue [that's not mine, and that's why I can't publish pics :shrug: ]:
Razors, in Black Handles . . . . 7s. 6d. each
Ditto Ivory . . . . . . . . . . . . .9s. 0d. each
Ditto...

The last page of a treatise on straight razors printed in London in 1830 reports an ad published by the author to sell his razors and related items. A good converter that can "translate" 1830 prices...