In Germany, you pay 30 cents per kWh. A laptop using 100 w/h would cost ~18 cents per 6 hours. To calculate the equipment cost, we assume an average laptop which equals a 2.5 years runtime, i.e. 900 days, for $500 or 20 cents per day. If the rewards are higher than ~40 cents, it’s worth it. Uni rewards ~40 UNW per hour worth ~$3 (by price on 12/2020). This doesn’t include additional benefits like voting rights or bonus tokens.
Unlike simple ‘hodling’, creating a Node gives you control and makes you an active part of a project. Take a look at your favorite blockchain/crypto projects and give it a shot.