The proceeds of such sale of lots shall be paid into the town treasury and kept separate from other funds of the town and subject to the order of the board. Such proceeds, with the income thereof, shall be devoted to maintaining, improving, and embellishing such burial grounds. If the town so votes, the board may sell lots upon condition that the proceeds therefrom shall be paid into the town treasury in trust and the income thereof be expended in caring for such lots and the structures thereon. The board shall fix the prices for such lots and make regulations in respect to the sale and care thereof.